Hello Werner:

This clip is from the EAA website pertaining to the use of Auto Gas.

"Another area of concern is high altitude vapor lock. All EAA flight test programs have included an evaluation of the adverse combination of volatility and temperatures, plus demonstrated climbs to the service ceiling of the aircraft, (which in the case of the Cessna 182 was 21,034 feet density altitude), and to also include some periods of cruise at altitudes above 7000 feet. Each airplane that we have flown in our 500-hour flight test program successfully completed these tests."

We know of no such altitude restriction when using an approved Auto Gas STC.

See their site at http://www.eaa.org/education/fuel/index.html for additional information.

COO Help Desk

I have a Mogas STC, but never use the stuff.  First of all where I fly I can't find it.  I would have to buy gas cans and illegally fill the aircraft, which I would never do unless being attacked by the local natives and need to flee.

I fly with 100 LL and have not had any problems in 1000 hours on my C172M (1973)Lycoming O320 E2D, 150 hp.  I get about 8.4 gph.  I cruise between 108 and 110 knots true air speed routinely at rated RPM for 75 % hp.  Atmospheric conditions affect hp and efficiency wherease, gross weight, aircraft center of gravity, verical components to the winds, surface friction, and airplane rigging also factor into fuel consumption during flight.

I didn't like Mogas because if not flown a lot it will emulsify much sooner than Avgas.  If you routinely fill your tanks, I wouldn't think that would be a problem.

my 2 cents

thanks for info. I usually fly tank close to 3/4 empty weekly, as i fly close to 200 hours  and go out 1-3 weekly, so that should not create a problem.

often when i fly overland (crosscountry) have to use Avgas 100 anyhow, as nothing else available at a lot of airport.

Regards
Werner

Mine came with the plane but its from peterson. The EAA also has one. I was looking at them before I discovered it in the logs / papers that came with the plane and it looks like both go for about $125. I figure I save around fifty-cents / gallon on average (much more since Katrina). I'm going to fly close to 200 hours this year at about 8 gallons / hour. I fly on autogas about half the time so it works out to about $400 / year. Its not much in the grand scheme but it all helps.  My big reason for using the mo-gas is to cut down on the leading on my exhaust valves and its really cut down on the problem so its worth it even without the cost savings. I have 4 5-gallon cans that I bring the fuel in to my hanger. We can't store fuel there so I need to bring it with me each time but it hasn't been a hassle.  I flew to South Dakota last year and found mo-gas at about half the airports I stopped at. Its not common to find it in Texas though so I usually use avgas at the other end.

Gary

Hello fellas - I run a C182P (with the 230HP Naturally aspirated continental) in Zimbabwe, Southern Africa. We are considering the use of mogas, either unleaded or the lead replacement version avail in South Africa in place of Avgas 100LL. Is this safe, is there anything we need to get done to the engine?